CN102412684B - Brushless double-feedback motor of winding rotor - Google Patents
Brushless double-feedback motor of winding rotor Download PDFInfo
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- CN102412684B CN102412684B CN201110345871.3A CN201110345871A CN102412684B CN 102412684 B CN102412684 B CN 102412684B CN 201110345871 A CN201110345871 A CN 201110345871A CN 102412684 B CN102412684 B CN 102412684B
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Abstract
The invention discloses a brushless double-feedback motor of a winding rotor, which belongs to winding rotor motors. The problems of low slot space utilization rate, effective conductor utilization rate of a rotor winding and winding coefficient of a traditional brushless double-feedback motor of the winding rotor are solved. A power winding and a control winding which are mutually independent are arranged on a stator; Z rotor slots and m phase rotor windings are distributed on a rotor core; each phase rotor winding is provided with a parallel branches; each parallel branch consists of two or three coil groups; first, second and third pitches which are different are respectively adopted in coils with different turn numbers in the first, second and third coil groups; the coils in each coil group are connected in series; and each coil group is in short-circuit connection. The turn number of each winding coil can be flexibly adjusted; the slot space utilization rate, the effective conductor utilization rate of the rotor winding and the winding coefficient can be improved by 5 to 15 percent; and other harmonic waves are inhibited and the content of the harmonic waves is reduced to the maximal degree.
Description
Technical field
The invention belongs to winding rotor motor, be specifically related to a kind of Wound rotor brushless double fed motor, its rotor adopts irregular pitch and the number of turn loop construction such as not.
Background technology
Brushless dual-feed motor has a wide range of applications in Large Copacity ac variable frequency speed regulation and in shaft generator peculiar to vessel, hydroelectric power generation and wind power generation, structure is simple, sturdy and durable, rotor is cancelled brush and slip ring, safe and reliable to operation, maintenance cost is low, its maximum advantage is that the capacity of required frequency converter is little, can reduce system cost.Brushless dual-feed motor is the AC induction motor be made up of the stator winding of the different number of pole-pairs of two covers and rotor, and two cover stator winding are called power winding and controlled winding, and rotor can adopt special cage modle, reluctance rotor or wound rotor.The rotor that brushless dual-feed motor general principle is through particular design makes two cover stator winding produce the rotating magnetic field Indirect Interaction of different number of pole-pairs, and can carry out control to realize energy transferring to its interaction; Motor as motor running, also as generator operation, can have the feature of asynchronous machine and synchronous machine concurrently.The connected mode of change controlled winding and the amplitude of power supply voltage and current, phase place and frequency can realize the multiple operational mode of brushless dual-feed motor.
The key factor affecting brushless dual-feed motor performance is the structure of rotor.The rotor main of domestic and international brushless dual-feed motor will adopt special cage modle and reluctance rotor two kinds of structures, and wherein special cage-type rotor processing and manufacturing is easy, with low cost; Reluctance rotor is firm in structure, and rotor is made up of iron-core lamination and permanent magnet, rotor does not have conductor and winding.Special cage-type rotor must make concentric type distribution short-circuited winding structure, and its iron core of reluctance rotor must make the structure of similar salient pole, under the restriction of these conditions, makes these two kinds of rotor structures all there is the large shortcoming of harmonic content.
The patent of invention " a kind of Wound rotor brushless double fed motor " of the patent No. 200910061297.1, comprise stators and rotators, stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1, p
2three-phase symmetric winding; Rotor core has m phase rotor windings, p
1, p
2for positive integer, and p
1≠ p
2, m=(p
1+ p
2)/m
k, as (p
1+ p
2) for odd number time, m
k=1; As (p
1+ p
2) for even number time, m
k=2; Its rotor winding coil adopts the structure of equal pitch (etc. span), by the rotor design requirement utilizing rotor windings slot ripples magnetomotive force to meet alternating-current brushless double feedback electric engine, slot space utilance, rotor windings active conductor utilance and winding coefficient are on the low side.
Summary of the invention
The invention provides a kind of Wound rotor brushless double fed motor, solve the problem that the slot space utilance of existing Wound rotor brushless double fed motor existence, rotor windings active conductor utilance and winding coefficient are on the low side.
A kind of Wound rotor brushless double fed motor of the present invention, comprises stators and rotators, and stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1, p
2three-phase symmetric winding; Described rotor core is circumferentially uniformly distributed Z rotor, Z=n (p
1+ p
2), rotor core has m phase rotor windings, every phase rotor windings has a bar parallel branch, every bar parallel branch is made up of two or three coil groups, and in every phase rotor windings, all coils electric current is the same, n=1 ~ 30, a=1 ~ 4, p
1, p
2be 1 ~ 30 and p
1≠ p
2, m=(p
1+ p
2)/m
k, as (p
1+ p
2) for odd number time, m
k=1; As (p
1+ p
2) for even number time, m
k=2; Work as p
1< p
2time, y
1, y
2, y
3span be Z/ (2p
2) ~ Z/ (2p
1) between integer, and y
1< y
2, y
1< y
3, y
2≠ y
3; Work as p
1> p
2time, y
1, y
2, y
3span be Z/ (2p
1) ~ Z/ (2p
2) between integer, and y
1< y
2, y
1< y
3, y
2≠ y
3; It is characterized in that:
When described parallel branch is made up of two coil groups, the first coil groups has the coil of 2 kinds of different numbers of turn, all adopts first segment apart from y
1=11, coil adds up to 9, and each coil turn is respectively 14 and 22; Second coil groups has the coil of 2 kinds of different numbers of turn, all adopts second section apart from y
2=14, coil adds up to 4, and each coil turn is respectively 2 and 7; Each coils connected in series in first coil groups, each coils connected in series in the second coil groups, the first coil groups and the second coil groups connect from short circuit; The magnetomotive force vector that described first coil groups produces superposes on the same axis with the magnetomotive force vector that the second coil groups produces;
When described parallel branch is made up of three coil groups, the first coil groups has the coil of 4 kinds of different numbers of turn, all adopts first segment apart from y
1=11, coil adds up to 10, and each coil turn is respectively 2,15,18,21; Second coil groups has the coil of 2 kinds of different numbers of turn, all adopts second section apart from y
2=14, coil adds up to 4, and each coil turn is respectively 2 and 3; Tertiary coil group has the coil of a kind of number of turn, adopts the 3rd pitch y
3=15, coil adds up to 2, and each coil turn is 7; Each coils connected in series in first coil groups, each coils connected in series in the second coil groups, each coils connected in series in tertiary coil group, the first coil groups and second, third coil groups connect from short circuit; The magnetomotive force vector that described first coil groups produces superposes on the same axis with the magnetomotive force vector that second, third coil groups produces.
Described Wound rotor brushless double fed motor, is characterized in that:
In described first coil groups, the coil of 2 kinds or the 4 kinds different numbers of turn is symmetrical with phase axis, and its number of turn presses the distribution of cosine rule.
The wound rotor structure that the present invention proposes, its Main Basis is theoretical and based on the application of irregular pitch and the number of turn coil sine windings theory such as not about winding " slot ripples " in AC MACHINE WINDING THEORY.First theoretical according to winding " slot ripples ", be designed to by rotor windings to induce number of pole-pairs is p simultaneously
1and p
2first-harmonic magnetomotive force, then theoretical based on sine windings, adopt irregular pitch and not etc. the number of turn coil rotor windings is adjusted, reduction motor harmonic content as far as possible.
For Z rotor, according to the symmetrical winding of m of number of pole-pairs p design, except generation number of pole-pairs is except the first-harmonic magnetomotive force of p, be also kZ ± p (k=1,2,3 by producing number of pole-pairs simultaneously, positive integer) slot ripples magnetomotive force, its winding coefficient is identical with first-harmonic.Number of pole-pairs ν=Z-p and ν=Z+p is less, is called the single order slot ripples of number of pole-pairs p first-harmonic.The single order slot ripples utilizing winding to produce, as rotor number Z=p
1+ p
2, p
1and p
2when being two kinds of numbers of pole-pairs required for brushless dual-feed motor, the main feature of " slot ripples " is as follows:
(1) for rotor number Z=p
1+ p
2, number of pole-pairs p
1with number of pole-pairs p
2a kind of conjugate relation, number of pole-pairs p
1the magnetomotive force produced and number of pole-pairs p
2the magnetomotive force produced occurs in pairs, and direction of rotation is contrary;
(2) number of pole-pairs p
1with number of pole-pairs p
2winding coefficient is equal.
According to the operation principle of brushless dual-feed motor, require that rotor windings can produce p simultaneously
1and p
2the rotating mmf of two kinds of different numbers of pole-pairs, and the magnetomotive force direction of rotation that these two kinds of numbers of pole-pairs produce is contrary.Theoretical according to above-mentioned " slot ripples ", the magnetomotive force that two kinds of different numbers of pole-pairs that " slot ripples " rotor windings is formed produce just meets the designing requirement of brushless double-fed machine rotor.But the rotor windings formed like this produces in magnetomotive force, except required number of pole-pairs p
1with number of pole-pairs p
2in addition, also exist kZ ± p (k=2,3,4 ... positive integer) etc. the slot ripples of other number of pole-pairs, these slot ripples, especially number of pole-pairs is lower, relative to number of pole-pairs p
1with number of pole-pairs p
2magnetomotive amplitude will be very large, have a strong impact on the performance of motor, must manage as far as possible to weaken, to reduce its impact.
According to Electrical Motor principle, increase rotor number, the requirement that motor slot coordinates can be met, and effectively weaken the slot ripples of other number of pole-pairs.For ensureing required number of pole-pairs p
1with number of pole-pairs p
2the magnetomotive force produced occurs in pairs, and rotor number should by (p
1+ p
2) integral multiple increase, namely also new rotor number Z meets relational expression: Z=n (p
1+ p
2), in formula, n is positive integer.The rotor number of phases is constant, remakes and connect from short circuit in every phase winding after number adjacent coil sequence series connection of all grooves.
Although increase the slot ripples that rotor number effectively can weaken other number of pole-pairs, such Distribution Effect inevitably weakens useful number of pole-pairs p
1with number of pole-pairs p
2magnetomotive force.In order to ensure that brushless dual-feed motor has good performance, must manage to make rotor windings magnetomotive Sine distribution arrangement under two kinds of different numbers of pole-pairs, number of pole-pairs p
1with number of pole-pairs p
2the magnetomotive force amplitude produced is large as far as possible, and the magnetomotive force amplitude that other number of pole-pairs harmonic wave in addition produces is little as far as possible.
It should be noted that, when increasing rotor number and adopt equal pitch winding, if utilize the coil in whole rotor, the induced potential at this moment having the generation of some coils in the every phase winding of rotor is cancelled out each other, for ensureing that rotor windings can produce stronger number of pole-pairs p
1with number of pole-pairs p
2magnetomotive force, just must remove a part of coil.On the basis abandoning a part of coil, for realizing rotor windings magnetomotive Sine distribution arrangement under two kinds of different numbers of pole-pairs, theoretical based on sine windings, rotor windings can adopt irregular pitch and the number of turn loop construction such as not.
Sine windings is the winding that a kind of " high accuracy " does not wait circle loop construction, be successfully applied to common single-phase with in three-phase induction motor design, harmonic carcellation is carried out by the number of turn of each coil of rational allocation and arrangement mode, to make in groove electric current circumferentially by Sine distribution, thus its synthesis magnetomotive force is comparatively ideal sine wave.Sine windings can do the adjustment of increase and decrease 1 circle and above quantity to each coil be often in series, its series coil number of turn has wider fine setting effect.Because sine windings has the ability of fine setting, therefore it can make to specify number of pole-pairs p
1with number of pole-pairs p
2under winding coefficient large as far as possible, and other number of pole-pairs harmonic winding factor is in addition little as far as possible.Sine windings theory is introduced the design of brushless dual-feed motor rotor windings and effectively can solve the larger problem of rotor windings harmonic content.
The rotor sine windings design of brushless dual-feed motor designs different with common sine windings, and it needs to ensure that the every phase winding of rotor is at number of pole-pairs p
1under magnetomotive force to make near sinusoidal arranged evenly, at number of pole-pairs p
2under magnetomotive force also to make near sinusoidal arranged evenly.Weaken the winding coefficient of other harmonic wave in order to the winding coefficient taken into account under two kinds of different numbers of pole-pairs simultaneously, the number of turn of the every phase coil of rotor sine windings configures according to positive rule, the turn ratio of each coil should be carried out value and carry out certain adjustment in the region that two kinds of number of pole-pairs Sine distribution arrangements obtain between turn ratio, and such winding distribution just can at number of pole-pairs p
1with number of pole-pairs p
2under to be near sinusoidal arranged evenly.The rotor sine windings energy adjustment tank interior loop number of turn changes number of pole-pairs p
1with number of pole-pairs p
2and the winding coefficient of other harmonic wave, thus change the proportion of magnetomotive force component in total magnetomotive force of each number of pole-pairs.
Wound rotor major design step of the present invention and rule as follows:
(1) a kind of suitable coil span is chosen as first segment distance, theoretical according to sine windings, the design not waiting circle loop construction is carried out to winding under this pitch, under first segment distance, the coil of the different number of turn is symmetrical with phase axis, and its number of turn presses the distribution of cosine rule.
(2) owing to utilizing a kind of wound rotor not waiting circle loop construction of pitch design, a part of active conductor can be there is in a part of coil abandoned well not utilized, therefore choose again another different pitch as second section apart from or other two kinds of different pitches as second, third pitch, under ensureing that the conductor placed in every groove is no more than the prerequisite of its maximum, utilizing the coil abandoned to adopt does not wait circle structure to carry out Winding Design, improves whole rotor windings number of pole-pairs p further
1with number of pole-pairs p
2the magnetomotive force amplitude produced.In every phase winding, all coils electric current is the same, and the magnetomotive force vector adopting the coil groups of first segment distance to produce superposes on the same axis with the magnetomotive force vector adopting the coil groups of second, third pitch to produce.
(3) number of pole-pairs p is followed
1with number of pole-pairs p
2the magnetomotive force amplitude produced is large as far as possible, and the principle that the magnetomotive force amplitude that other number of pole-pairs harmonic wave in addition produces is little as far as possible, to often phase two kinds or three kinds of different pitch coil groups do to connect from short circuit, each coil sequence series connection not waiting circle in coil groups, utilize slot-number phase graph and harmonic analysis result, to two kinds or three kinds of different pitch coil groups, in coil groups, the number of turn of each coil is optimized and revised further.
In winding coil of the present invention, the coil groups of parallel branch adopts two kinds or three kinds of different pitches, in coil groups, the number of turn of each coil can adjust flexibly, and the utilance of slot space, the active conductor utilance of rotor windings and winding coefficient improve 5% ~ 15%; Winding magnetomotive near sinusoidal under two kinds of different numbers of pole-pairs can be realized arranged evenly, at utmost suppress all the other harmonic waves, reduce harmonic content.
Accompanying drawing explanation
Fig. 1 (a) is Z=6, p
1slot-number phase graph when=2;
Fig. 1 (b) is Z=6, p
1three-phase groove PHASE DISTRIBUTION figure when=2;
Fig. 2 (a) is Z=6, p
2slot-number phase graph when=4;
Fig. 2 (b) is Z=6, p
2three-phase groove PHASE DISTRIBUTION figure when=4;
Fig. 3 is Z=6, p
1=2, p
2three-phase wound-rotor winding connection figure when=4;
Fig. 4 (a) is Z=84, p
1slot-number phase graph when=2;
Fig. 4 (b) is Z=84, p
1three-phase groove PHASE DISTRIBUTION figure when=2;
Fig. 5 (a) is Z=84, p
2slot-number phase graph when=4;
Fig. 5 (b) is Z=84, p
2three-phase groove PHASE DISTRIBUTION figure when=4;
Fig. 6 is Z=84, p
1=2, p
2=4, y
1the three-phase wound-rotor winding connection figure of whole embedded coil is utilized when=11;
Fig. 7 is Z=84, p
1=2, p
2=4, y
1the three-phase wound-rotor winding connection figure not waiting circle coil is adopted when=11;
Fig. 8 is that the present invention works as Z=84, p
1=2, p
2=4, y
1=11 and y
2the three-phase wound-rotor winding connection figure of two kinds of irregular pitch, the circle coil such as is not adopted when=14;
Fig. 9 (a) is Z=84, p
1=2, p
2=4, y
1=11 and y
2adopt two kinds of irregular pitch, the circle coil such as not at p when=14
1slot-number phase graph under=2 and the groove PHASE DISTRIBUTION figure under the different pitch of a phase winding;
Fig. 9 (b) is Z=84, p
1=2, p
2=4, y
1=11 and y
2adopt two kinds of irregular pitch, the circle coil such as not at p when=14
2slot-number phase graph under=4 and the groove PHASE DISTRIBUTION figure under the different pitch of a phase winding;
Figure 10 is that the present invention works as Z=84, p
1=2, p
2=4, y
1=11, y
2=14 and y
3the three-phase wound-rotor winding connection figure of three kinds of irregular pitch, the circle coil such as is not adopted when=15;
Figure 11 (a) is Z=84, p
1=2, p
2=4, y
1=11, y
2=14 and y
3adopt two kinds of irregular pitch, the circle coil such as not at p when=15
1slot-number phase graph under=2 and the groove PHASE DISTRIBUTION figure under the different pitch of a phase winding;
Figure 11 (b) is Z=84, p
1=2, p
2=4, y
1=11, y
2=14 and y
3adopt two kinds of irregular pitch, the circle coil such as not at p when=15
2slot-number phase graph under=4 and the groove PHASE DISTRIBUTION figure under the different pitch of a phase winding;
Figure 12 is that the present invention works as Z=84, p
1=2, p
2=4, y
1=12 and y
2the three-phase wound-rotor winding connection figure of two kinds of irregular pitch, the circle coil such as is not adopted when=14.
Figure 13 (a) is Z=84, p
1=2, p
2=4, y
1=12 and y
2adopt two kinds of irregular pitch, the circle coil such as not at p when=14
1slot-number phase graph under=2 and the groove PHASE DISTRIBUTION figure under the different pitch of a phase winding;
Figure 13 (b) is Z=84, p
1=2, p
2=4, y
1=12 and y
2adopt two kinds of irregular pitch, the circle coil such as not at p when=14
2slot-number phase graph under=4 and the groove PHASE DISTRIBUTION figure under the different pitch of a phase winding.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Comparative example 1:
Wound rotor brushless double fed motor, comprises stators and rotators, and stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1=2, p
2the three-phase symmetric winding of=4; Rotor core is circumferentially uniformly distributed 6 rotor, there are 3 phases, often have the rotor windings of 1 parallel branch mutually.
For Z=6, p
1=2, p
2=4 and the rotor windings of m=3, in order to obtain the concrete mode of connection, provide Z=6, p
1slot-number phase graph when=2, as shown in Fig. 1 (a), in figure, the horizontal length of whole slot-number phase graph is 360 ° of electrical degrees, contain positive groove number and negative groove number, wherein number representative of positive groove is to the magnetomotive force vector acting in accordance with the coil generation connecing series connection, and the magnetomotive force vector that the coil that negative groove number represents corresponding reversal connection series connection produces; Slot-number phase graph is divided into each region accounting for 60 °, mark three and eachly account for the region of 60 ° and the region of mutual deviation 120 °, groove number in three regions just represents groove number shared by three-phase respectively, the each phase groove number distribution obtained with this is as shown in Fig. 1 (b), wherein A phase takies groove numbers 1,4, B phase takies groove number 2,5, C phases and takies groove numbers 3,6.
Z=6, p
2slot-number phase graph when=4, as shown in Fig. 2 (a), in figure, the horizontal length of whole slot-number phase graph is 360 ° of electrical degrees, slot-number phase graph is divided into each region accounting for 60 °, mark three and eachly account for the region of 60 ° and the region of mutual deviation 120 °, groove number in three regions just represents groove number shared by three-phase respectively, and number distribution of each phase groove of obtaining with this is as shown in Fig. 2 (b), and wherein A phase takies groove numbers 1,4, B phase takies groove number 3,6, C phases and takies groove numbers 2,5.
Contrasted from Fig. 1 (b) and Fig. 2 (b), Z=6, p
1when=2 and Z=6, p
2a, B, C three-phase groove number distribution phase sequence when=4 is just in time contrary, Z=6, p
1wherein arbitrary phase groove number distribution meeting and Z=6, p when=2
2a phase groove number distribution when=4 is consistent.
When every phase rotor windings coil adopts first segment apart from y
1=1, Z=6, p
1when=2 and Z=6, p
2phase winding breadth coefficient when=4 is 1, and winding coefficient is 0.866.These 2 theory narratives both met about winding " slot ripples ", have also met the requirement about brushless dual-feed motor working rotor principle.
Fig. 3 gives Z=6, p
1=2, p
2the concrete mode of connection of three-phase wound-rotor winding when=4, in figure, the coil groups on the left side is the 1st phase rotor windings, takies groove numbers 1,4; Middle coil groups is the 2nd phase rotor windings, takies groove numbers 2,5; The coil groups on the right is the 3rd phase rotor windings, and take groove numbers 3,6, every phase coil group connects from short circuit.
As Z=6, rotor number is very few, and rotor windings can be caused to induce the larger harmonic wave of other content, thus makes the loss of motor comparatively large, and degraded performance, vibration and noise also can be excessive, so just can not reach the requirement of practical application in industry.For addressing this problem, consider to adopt more groove number.
Comparative example 2:
Wound rotor brushless double fed motor, comprises stators and rotators, and stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1=2, p
2the three-phase symmetric winding of=4; Rotor core is circumferentially uniformly distributed 84 rotor, there are 3 phases, often have the rotor windings of 2 branch roads mutually.
After increasing rotor number, in rotor windings, the magnetomotive force of other harmonic wave can obviously weaken, the number of pole-pairs p simultaneously
1with number of pole-pairs p
2the impact that magnetomotive force is also subject to Distribution Effect inevitably reduces.
Z=84, p
1slot-number phase graph when=2 is as shown in Fig. 4 (a), in figure, the horizontal length of whole slot-number phase graph is 360 ° of electrical degrees, slot-number phase graph is divided into each region accounting for 60 °, mark three and eachly account for the region of 120 ° and the region of mutual deviation 120 °, groove number in three regions just represents groove number shared by three-phase respectively, the each phase groove number distribution obtained with this is as shown in Fig. 4 (b), wherein A phase takies groove numbers 1 ~ 14,43 ~ 56, B phase takies groove number 15 ~ 28,57 ~ 70, C phases and takies groove numbers 29 ~ 42,71 ~ 84.
Z=84, p
2slot-number phase graph when=4 is as shown in Fig. 5 (a), in figure, the horizontal length of whole slot-number phase graph is 360 ° of electrical degrees, slot-number phase graph is divided into each region accounting for 60 °, mark three and eachly account for the region of 240 ° and the region of mutual deviation 120 °, groove number in three regions just represents groove number shared by three-phase respectively, the each phase groove number distribution obtained with this is as shown in Fig. 5 (b), wherein A phase takies groove numbers 1 ~ 14,43 ~ 56, B phase takies groove number 29 ~ 42,71 ~ 84, C phases and takies groove numbers 15 ~ 28,57 ~ 70.
From Fig. 4 (b) and Fig. 5 (b), at this moment rotor windings groove number is distributed in p
1be for=2 times 120 ° of electrical degrees, at p
2be for=4 times 240 ° of electrical degrees, its winding coefficient is compared all to have had with comparative example 1 and is significantly reduced.
Fig. 6 gives Z=84, p
1=2, p
2the concrete mode of connection of the three-phase wound-rotor winding of whole embedded coil is utilized, wherein first-pitch of coil y when=4
1in=11, figure, the 1st, the 1st, 2 article of parallel branch of 2 behaviors the 1st phase rotor windings, wherein the 1st article of parallel branch takies groove number the 1 ~ 14,2nd article parallel branch and takies groove numbers 43 ~ 56; 3rd, the 1st, 2 article of parallel branch of 4 behaviors the 2nd phase rotor windings, wherein the 1st article of parallel branch takies groove number the 29 ~ 42,2nd article parallel branch and takies groove numbers 71 ~ 84; 5th, the 1st, 2 article of parallel branch of 6 behaviors the 3rd phase rotor windings, wherein the 1st article of parallel branch takies groove number the 15 ~ 28,2nd article parallel branch and takies groove numbers 57 ~ 70; Every every bar branch road coil groups mutually connects from short circuit.Under this mode of connection, p
1=2 winding coefficients are 0.6068, p
2=4 winding coefficients are 0.4139.
Fig. 7 gives Z=84, p
1=2, p
2a kind of mode of connection not waiting circle coil version rotor windings is adopted, wherein first-pitch of coil y when=4
1in=11, figure, the 1st, the 1st, 2 article of parallel branch of 2 behaviors the 1st phase rotor windings, wherein the 1st article of parallel branch takies groove number the 2 ~ 13,2nd article parallel branch and takies groove numbers 44 ~ 55; 3rd, the 1st, 2 article of parallel branch of 4 behaviors the 2nd phase rotor windings, wherein the 1st article of parallel branch takies groove number the 30 ~ 41,2nd article parallel branch and takies groove numbers 72 ~ 83; 5th, the 1st, 2 article of parallel branch of 6 behaviors the 3rd phase rotor windings, wherein the 1st article of parallel branch takies groove number the 16 ~ 27,2nd article parallel branch and takies groove numbers 58 ~ 69; Every every bar branch road coil groups mutually connects from short circuit, groove subscript numeral coil turn.
This coil such as circle such as not grade not waiting the rotor windings of circle loop construction to meet every phase winding is symmetrical with phase axis, and its number of turn presses the feature of cosine rule distribution.Under the mode of connection of Fig. 7, each phase coil total number of turns is 160, p
1=2 effective turns and winding coefficient are respectively 106.7 and 0.6666, p
2=4 effective turns and winding coefficient are respectively 107.6 and 0.6725, and winding coefficient is enhanced compared with the mode of connection of Fig. 6, and the content of other harmonic wave of winding magnetomotive force is well controlled.
Owing to being subject to the consistent restriction of coil span, a part of active conductor can being there is in a part of coil abandoned and well do not utilized in the mode of connection of Fig. 7.When ensureing that the magnetomotive force content of other harmonic wave is lower, in order to improve rotor windings further at p
1=2 and p
2winding coefficient under=4 and conductor utilization, can adopt the rotor windings of irregular pitch and the circle loop construction such as not.
Embodiment 1:
Comprise stators and rotators, stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1=2, p
2the three-phase symmetric winding of=4; Rotor core is circumferentially uniformly distributed 84 rotor, rotor core has 3 phase rotor windings, every phase rotor windings has 2 parallel branches, every bar parallel branch is made up of two coil groups,
In parallel branch, the first coil groups has the coil of 2 kinds of different numbers of turn, all adopts first segment apart from y
1=11, coil adds up to 9, and each coil turn is respectively 14 and 22; Second coil groups has the coil of 2 kinds of different numbers of turn, all adopts second section apart from y
2=14, coil adds up to 4, and each coil turn is respectively 2 and 7; Each coils connected in series in first coil groups, each coils connected in series in the second coil groups, the first coil groups and the second coil groups connect from short circuit;
Fig. 8 gives the mode of connection of embodiment 1, in figure, 1st, the 1st, 2 article of parallel branch of 2 behaviors the 1st phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 4 ~ 12, second coil groups takies groove numbers 2,3,10,11, article 2, parallel branch first coil groups takies groove number 46 ~ 54, second coil groups and takies groove numbers 44,45,52,53; 3rd, the 1st, 2 article of parallel branch of 4 behaviors the 2nd phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 32 ~ 40, second coil groups takies groove numbers 30,31,38,39, article 2, parallel branch first coil groups takies groove number 74 ~ 82, second coil groups and takies groove numbers 72,73,80,81; 5th, the 1st, 2 article of parallel branch of 6 behaviors the 3rd phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 18 ~ 26, second coil groups takies groove numbers 16,17,24,25, article 2, parallel branch first coil groups takies groove number 60 ~ 68, second coil groups and takies groove numbers 58,59,66,67; Groove subscript numeral coil turn, groove label subscript numeral coil span.The coil groups of this mode of connection first segment distance, the coil meeting the different number of turn is symmetrical with phase axis, and its number of turn presses the feature of cosine rule distribution.
Fig. 9 (a) gives the mode of connection shown in Fig. 8 at p
1groove PHASE DISTRIBUTION figure under the different pitch of slot-number phase graph under=2 and the 1st phase rotor windings, in figure, 4 line number words above give Z=84, p
1slot-number phase graph when=2, y
1the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings first coil groups on the right of in the of=11, the magnetomotive force vector that the first coil groups produces is superimposed upon on phase axis; y
2the groove PHASE DISTRIBUTION of four lines digitized representation the 1st phase rotor windings second coil groups on the right of in the of=14, the magnetomotive force vector that the second coil groups produces also is superimposed upon on phase axis.
Fig. 9 (b) gives the mode of connection shown in Fig. 8 at p
2groove PHASE DISTRIBUTION figure under the different pitch of slot-number phase graph under=4 and the 1st phase rotor windings, in figure, 4 line number words above give Z=84, p
2slot-number phase graph when=4, y
1the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings first coil groups on the right of in the of=11, the magnetomotive force vector that the first coil groups produces is superimposed upon on phase axis; y
2the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings second coil groups on the right of in the of=14, the magnetomotive force vector that the second coil groups produces also is superimposed upon on phase axis.
Can be found out by the 1st phase rotor windings groove PHASE DISTRIBUTION in Fig. 9 (a) and Fig. 9 (b), the magnetomotive force vector that first coil groups produces superposes on the same axis with the magnetomotive force vector that the second coil groups produces, from winding symmetry, the 2nd phase rotor windings and the 3rd phase rotor windings also meet this feature.
Under the mode of connection of embodiment 1, each phase coil total number of turns is 168, p
1=2 effective turns and winding coefficient are respectively 116.3 and 0.6922, p
2=4 effective turns and winding coefficient are respectively 121.4 and 0.7225, and coil total number of turns, effective turn and winding coefficient are average compared with the mode of connection of Fig. 7 improves about 7.6%, wherein p
2=4 effective turn increase rates are maximum reaches 12.8%, and the content of other harmonic wave of winding magnetomotive force also can be well controlled.
Embodiment 2:
Comprise stators and rotators, stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1=2, p
2the three-phase symmetric winding of=4; Rotor core is circumferentially uniformly distributed 84 rotor, rotor core has 3 phase rotor windings, every phase rotor windings has 2 parallel branches, every bar parallel branch is made up of three coil groups,
In described parallel branch, the first coil groups has the coil of 4 kinds of different numbers of turn, all adopts first segment apart from y
1=11, coil adds up to 10, and each coil turn is respectively 2,15,18 and 21; Second coil groups has the coil of 2 kinds of different numbers of turn, all adopts second section apart from y
2=14, coil adds up to 4, and each coil turn is respectively 2 and 3; Tertiary coil group has the coil of a kind of number of turn, adopts the 3rd pitch y
3=15, coil adds up to 2, and each coil turn is 7; Each coils connected in series in first coil groups, each coils connected in series in the second coil groups, each coils connected in series in tertiary coil group, the first coil groups and second, third coil groups connect from short circuit;
Figure 10 gives the mode of connection of embodiment 2, in figure, 1st, the 1st, 2 article of parallel branch of 2 behaviors the 1st phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 3 ~ 12, second coil groups takies groove numbers 1,3,9,11, and tertiary coil group takies groove number the 2,9, the 2nd article parallel branch first coil groups and takies groove numbers 45 ~ 54, second coil groups takies groove numbers 43,45,51,53, and tertiary coil group takies groove numbers 44,51; 3rd, the 1st, 2 article of parallel branch of 4 behaviors the 2nd phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 31 ~ 40, second coil groups takies groove numbers 29,31,37,39, tertiary coil group takies groove numbers 30,37, article 2, parallel branch first coil groups takies groove numbers 73 ~ 82, second coil groups takies groove numbers 71,73,79,81, and tertiary coil group takies groove numbers 72,79; 5th, the 1st, 2 article of parallel branch of 6 behaviors the 3rd phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 17 ~ 26, second coil groups takies groove numbers 15,17,23,25, tertiary coil group takies groove numbers 16,23, article 2, parallel branch first coil groups takies groove numbers 59 ~ 68, second coil groups takies groove numbers 57,59,65,67, and tertiary coil group takies groove numbers 58,65; Groove subscript numeral coil turn, groove label subscript numeral coil span.The coil groups of this mode of connection first segment distance, the coil meeting the different number of turn is symmetrical with phase axis, and its number of turn presses the feature of cosine rule distribution.
Figure 11 (a) gives the mode of connection shown in Figure 10 at p
1groove PHASE DISTRIBUTION figure under the different pitch of slot-number phase graph under=2 and the 1st phase rotor windings, in figure, 4 line number words above give Z=84, p
1slot-number phase graph when=2, y
1the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings first coil groups on the right of in the of=11, the magnetomotive force vector that the first coil groups produces is superimposed upon on phase axis; y
2the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings second coil groups on the right of in the of=14, y
3the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings tertiary coil groups on the right of in the of=15, the magnetomotive force vector that second, third coil groups produces also is superimposed upon on phase axis.
Figure 11 (b) gives the mode of connection shown in Figure 10 at p
2groove PHASE DISTRIBUTION figure under the different pitch of slot-number phase graph under=4 and the 1st phase rotor windings, in figure, 4 line number words above give Z=84, p
2slot-number phase graph when=4, y
1the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings first coil groups on the right of in the of=11, the magnetomotive force vector that the first coil groups produces is superimposed upon on phase axis; y
2the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings second coil groups on the right of in the of=14, y
3the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings tertiary coil groups on the right of in the of=15, the magnetomotive force vector that second, third coil groups produces also is superimposed upon on phase axis.
Can be found out by the 1st phase rotor windings groove PHASE DISTRIBUTION in Figure 11 (a) and Figure 11 (b), the magnetomotive force vector that first coil groups produces superposes on the same axis with the magnetomotive force vector that the second coil groups produces, from winding symmetry, the 2nd phase rotor windings and the 3rd phase rotor windings also meet this feature.
Under the mode of connection of embodiment 2, each phase coil total number of turns is 166, p
1=2 effective turns and winding coefficient are respectively 116.4 and 0.7011, p
2=4 effective turns and winding coefficient are respectively 120.5 and 0.7259, p
1=2 and p
2the winding coefficient of=4 can reach more than 0.7, and the content of other harmonic wave of winding magnetomotive force is also very low.
Embodiment 3:
Comprise stators and rotators, stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1=2, p
2the three-phase symmetric winding of=4; Rotor core is circumferentially uniformly distributed 84 rotor, rotor core has 3 phase rotor windings, every phase rotor windings has 2 parallel branches, every bar parallel branch is made up of two coil groups,
In parallel branch, the first coil groups has the coil of 4 kinds of different numbers of turn, all adopts first segment apart from y
1=12, coil adds up to 10, and each coil turn is respectively 5,13,15 and 21; Second coil groups has the coil of 2 kinds of different numbers of turn, all adopts second section apart from y
2=14, coil adds up to 8, and each coil turn is respectively 3 and 4; Each coils connected in series in first coil groups, each coils connected in series in the second coil groups, the first coil groups and the second coil groups connect from short circuit;
Figure 12 gives the mode of connection of embodiment 3, in figure, 1st, the 1st, 2 article of parallel branch of 2 behaviors the 1st phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 3 ~ 12, second coil groups takies groove numbers 1 ~ 4,9 ~ 12, article 2, parallel branch first coil groups takies groove number 45 ~ 54, second coil groups and takies groove numbers 43 ~ 46,51 ~ 54; 3rd, the 1st, 2 article of parallel branch of 4 behaviors the 2nd phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 31 ~ 40, second coil groups takies groove numbers 29 ~ 32,37 ~ 40, article 2, parallel branch first coil groups takies groove number 73 ~ 82, second coil groups and takies groove numbers 71 ~ 74,79 ~ 82; 5th, the 1st, 2 article of parallel branch of 6 behaviors the 3rd phase rotor windings, wherein the 1st article of parallel branch first coil groups takies groove numbers 17 ~ 26, second coil groups takies groove numbers 15 ~ 18,23 ~ 26, article 2, parallel branch first coil groups takies groove number 59 ~ 68, second coil groups and takies groove numbers 57 ~ 60,65 ~ 68; Groove subscript numeral coil turn, groove label subscript numeral coil span.The coil groups of this mode of connection first segment distance, the coil meeting the different number of turn is symmetrical with phase axis, and its number of turn presses the feature of cosine rule distribution.
Figure 13 (a) gives the mode of connection shown in Figure 12 at p
1groove PHASE DISTRIBUTION figure under the different pitch of slot-number phase graph under=2 and the 1st phase rotor windings, in figure, 4 line number words above give Z=84, p
1slot-number phase graph when=2, y
1the groove PHASE DISTRIBUTION of four lines digitized representation the 1st phase rotor windings first coil groups on the right of in the of=12, the magnetomotive force vector that the first coil groups produces is superimposed upon on phase axis; y
2the groove PHASE DISTRIBUTION of four lines digitized representation the 1st phase rotor windings second coil groups on the right of in the of=14, the magnetomotive force vector that the second coil groups produces also is superimposed upon on phase axis.
Figure 13 (b) gives the mode of connection shown in Figure 12 at p
2groove PHASE DISTRIBUTION figure under the different pitch of slot-number phase graph under=4 and the 1st phase rotor windings, in figure, 4 line number words above give Z=84, p
2slot-number phase graph when=4, y
1the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings first coil groups on the right of in the of=12, the magnetomotive force vector that the first coil groups produces is superimposed upon on phase axis; y
2the groove PHASE DISTRIBUTION of two row digitized representation the 1st phase rotor windings second coil groups on the right of in the of=14, the magnetomotive force vector that the second coil groups produces also is superimposed upon on phase axis.
Can be found out by the 1st phase rotor windings groove PHASE DISTRIBUTION in Figure 13 (a) and Figure 13 (b), the magnetomotive force vector that first coil groups produces superposes on the same axis with the magnetomotive force vector that the second coil groups produces, from winding symmetry, the 2nd phase rotor windings and the 3rd phase rotor windings also meet this feature.
Under the mode of connection of embodiment 3, each phase coil total number of turns is 166, p
1=2 effective turns and winding coefficient are respectively 121.2 and 0.7302, p
2=4 effective turns and winding coefficient are respectively 112.4 and 0.6773, and the content of other harmonic wave of winding magnetomotive force is also very low.
Claims (2)
1. a Wound rotor brushless double fed motor, comprises stators and rotators, and stator has separate power winding and controlled winding, power winding and controlled winding are respectively number of pole-pairs p
1, p
2three-phase symmetric winding; Described rotor core is circumferentially uniformly distributed Z rotor, Z=n (p
1+ p
2), rotor core has m phase rotor windings, every phase rotor windings has a bar parallel branch, every bar parallel branch is made up of two or three coil groups, and in every phase rotor windings, all coils electric current is the same, n=1 ~ 30, a=1 ~ 4, p
1, p
2be 1 ~ 30 and p
1≠ p
2, m=(p
1+ p
2)/m
k, as (p
1+ p
2) for odd number time, m
k=1; As (p
1+ p
2) for even number time, m
k=2; Work as p
1< p
2time, y
1, y
2, y
3span be Z/ (2p
2) ~ Z/ (2p
1) between integer, and y
1< y
2, y
1< y
3, y
2≠ y
3; Work as p
1> p
2time, y
1, y
2, y
3span be Z/ (2p
1) ~ Z/ (2p
2) between integer, and y
1< y
2, y
1< y
3, y
2≠ y
3; It is characterized in that:
When described parallel branch is made up of two coil groups, the first coil groups has the coil of 2 kinds of different numbers of turn, all adopts first segment apart from y
1=11, coil adds up to 9, and each coil turn is respectively 14 and 22; Second coil groups has the coil of 2 kinds of different numbers of turn, all adopts second section apart from y
2=14, coil adds up to 4, and each coil turn is respectively 2 and 7; Each coils connected in series in first coil groups, each coils connected in series in the second coil groups, the first coil groups and the second coil groups connect from short circuit; The magnetomotive force vector that described first coil groups produces superposes on the same axis with the magnetomotive force vector that the second coil groups produces;
When described parallel branch is made up of three coil groups, the first coil groups has the coil of 4 kinds of different numbers of turn, all adopts first segment apart from y
1=11, coil adds up to 10, and each coil turn is respectively 2,15,18,21; Second coil groups has the coil of 2 kinds of different numbers of turn, all adopts second section apart from y
2=14, coil adds up to 4, and each coil turn is respectively 2 and 3; Tertiary coil group has the coil of a kind of number of turn, adopts the 3rd pitch y
3=15, coil adds up to 2, and each coil turn is 7; Each coils connected in series in first coil groups, each coils connected in series in the second coil groups, each coils connected in series in tertiary coil group, the first coil groups and second, third coil groups connect from short circuit; The magnetomotive force vector that described first coil groups produces superposes on the same axis with the magnetomotive force vector that second, third coil groups produces.
2. Wound rotor brushless double fed motor as claimed in claim 1, is characterized in that:
In described first coil groups, the coil of 2 kinds or the 4 kinds different numbers of turn is symmetrical with phase axis, and its number of turn presses the distribution of cosine rule.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110345871.3A CN102412684B (en) | 2011-11-04 | 2011-11-04 | Brushless double-feedback motor of winding rotor |
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| CN102412684B true CN102412684B (en) | 2015-05-20 |
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| CN104868672B (en) * | 2015-04-23 | 2017-12-22 | 合肥工业大学 | A kind of iron-core-free Double-stator motor |
| CN104993629B (en) * | 2015-06-29 | 2018-03-02 | 合肥工业大学 | A kind of Wound-rotor type linear brushless double-fed generator |
| CN106787478B (en) * | 2016-12-29 | 2019-08-09 | 北京航天控制仪器研究所 | Unicast winding permanent magnet direct current motor brush localization method based on the second pitch |
| CN106953439B (en) * | 2017-05-04 | 2019-03-12 | 重庆大学 | Brushless dual-feed motor series parallel type cage type rotor structure and winding method |
| JP7002546B2 (en) * | 2017-07-27 | 2022-01-20 | 三菱電機株式会社 | Rotating machine |
| CN109301961A (en) * | 2018-11-13 | 2019-02-01 | 哈尔滨理工大学 | A kind of high-tension winding double frequency electrical machinery |
| CN110635721A (en) * | 2019-09-18 | 2019-12-31 | 合肥工业大学 | Soft start winding type brushless double-fed motor |
| CN110571997B (en) * | 2019-09-18 | 2021-01-19 | 江苏富丽华通用设备股份有限公司 | Three-phase asynchronous motor stator winding turn number distribution method for fan |
| CN111355317B (en) * | 2020-04-09 | 2021-08-27 | 合肥巨一动力系统有限公司 | Flat wire stator and flat wire motor |
| CN113890297B (en) * | 2021-10-08 | 2022-11-01 | 哈尔滨工业大学 | Low-space harmonic single-double layer winding radial magnetic flux five-phase permanent magnet synchronous motor |
| CN115800670A (en) * | 2022-12-09 | 2023-03-14 | 华中科技大学 | Electric excitation brushless double-fed direct-current generator applied to direct-current micro-grid |
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